Delete the C:\Users\pedro.costa\AppData\Local\Xamarin\zips folder and recompile the project.

Update the Xamarin.Android.Support.* nuget packages, but when I try it, I also get those build errors.

I've done a lot of research and it seems that the Android.Support.* folders should havy files inside it, and that those files should be downloaded when the android solution is built, but it is not happening for me.